Improvement in injectors



J. FERGUS.

"INJECTOR Patented March 7,1878.

Mmm @wm/f N. PETERS, PHDTOL|THOGRAPHER, WASHINGTONy D. C.

UNITED STATES 'PATENT OFFICE.

JAMES FEEGUS, 0E PHILADELPHIA, PENNSYLVANIA, AssIGNon 0E ONE- HALE HISEIGHT To JAMES A. BROWN.; AND SAID FEnGUs AND Eno wN ASSIGNOES 0E PARToF THEIR EIGHT To GEORGE H. ooLKET, oF

SAME PLAGE.

IMPROVEMENT IN INJECTORS.

Specification forming part of Letters Patent No. l

74,509, dated March 7, 1876; application iled July 2, 1G75.

To alt whom t may concern:

Be it known that I, JAMES FERGUS, ot Philadelphia, Pennsylvania, haveinvented certain Improvements in Injectors, of which the .tol-

lowing is a specification:

Themain object of my invention is to so construct an injector that theoperating parts can be readily removed from the body, forpuroverflow-branch d, the said body A being enlarged in diameter whereeach of these branches communicate with it, so as to form asteamchamber, a', water-chamber, b", and overflowchamber, d. Throughoutthe entire length the body A has a central opening, into which is fittedthe detachable tubeB, andjn the latter are formed the steam-nozzle e andthe usual passages j' and f', openings g and h serving to establishcolnmunicationV between the interior of the tube B and the water-branchb and overflow-branch d.

The admission of steam to the nozzle c is regulated by the position ofthe said nozzle in respect to the valve-spindle i', which projects froma tapering plug, D, adapted to a tapering seat in the end of the body A.

The spindle i is threaded throughout a portion of its length, and tothis threaded portion is adapted a nut, j, secured to the end ot' the,tube B, the nutbeing Slotted at its opposite sides, and adapted to ribsk formed on the opposite Sides of the casing of the Water-chamber c', sothat, by turning the said Spindle i by means of its handle l, the tube Bmay be advanced or retracted and the steam-space enlarged or contractedat pleasure.

The plug D is confined to its seat by the uut m. The nozzle e and theopening g of the tubeB are so arranged in respect to each other thatwhen the former is closed by the valvespindle i, the latter will beclosed, or nearly closed, by the rear edge ot' the water-chamber b', sothat the admission of both steam and water will be gradually increasedas the tube B is moved forward, until both passages are fully open. f

The outer end of the tube B is reduced in diameter at E, 'as shown moreclearly in Fi g. 2, and this reduced portion E is adapted to acorrespondingly reduced portion of the openingin the body AI ot' theinjector, on the edge ot' which portion is formed a valve-seat, n,adapted to a valve, o, formed on the body of the tube B around the edgeof the opening IL, so that when the tube is moved forward to its fullextent, the valve will bear on its seat, and

the opening hf and overflow-branch will be closed. i

The openings g and h are so arranged in respect to each other, however,that when the latter is closed the former will-be open, or partly open,and steam can pass-back around the nozzle e,'through the openings g andthrough the branch b into the feed-tank, thus serving to heat the waterin the same, this being of especial advantage in injectors forlocomotiveboilers, as it prevents the freezing ofthe water in thefeed-tank.

I provide the check-valveFin the dischargepassage of the injector with adisk or valve, 19, and a ring, p', the two bei-ng connected together byarms q, which guide the valve perfectly, while the disk p and ring p oera trm bearing for the valve at the ends, and eectually prevent itsdisplacement, while, by dispensing with the usual guiding-bridge, thepassage for the water is enlarged, and the back pressure ot' steam toclose the valve has its full ei'ect.

The valve s of the overliow-branch, instead of having a stem embraced bya spring, as usual, has a socket formed in its lower p0rtion, in whichtits the upper end of the operating-sprin g, tfthe lower end of whichembraces a pin, u, on a bridge, fo, extending across theoverflow-branch, so that, on the depression of the valve s, the spring twill be contained within the socketof the same, and will be protectedfrom the injurious eii'ects of steam or hot Water passing through thetube.

It will be evident that by employing a detachable tubein which arecombined the steamjet, water-passages, 85e., the work upon these partscan be much more easily andaccurately performed than it they formed partof the body itself', while the making of repairs or remedying ot'accidents can be et'ected with greater facilityand at less cost thanattends the repairingfof ordinary injectors.

A prominent advantage resulting from the detachability of the tube B isthis, that the body ofthe injector, when said tubeis removed, can beused as a feed-pipe for illin g the boiler, the area of the opening inthe body being sut'- ficient for this purpose, thus dispensing with theseparate arrangement ordinarily used.

In some instances in which it is desirable that the tube B, thoughremovable, shall not reciprocate, said stem may be secured in properposition within the body, by means of aset` screw or other fastening,and a movable valvespindle may be employed.

I claim as my inventionl. The combination, with the body of aninjector', of a removable tube, B, adapted to a longitudinal opening insaid body, and provided with a steam-nozzle, and inlet and ontletopenings, the'whole being combined with a fixed or movable valve-stem,as herein set forth.

2. The combination of a body, A, and its chambers a', b', and d', andthe fixed valvespindle t', with the movable tube B, its nozzle e,passages f f', and openings g and h, and with devices for operating thesaid tube.

3. The combination of the tapering plug D, and its projecting valve-stemi, partly threaded, as described, withfthe tube B and its nut j. therecessed edges of which are adapted to ribs k on the body of theinjector, as described.

4. rlhe combination of thewater-chamber b and overflow-chamber d of theinjector With the openings g and 71J in the tube B, said openings beingarranged in respect to each other as and for the purpose herein setforth.

' 5. The combination of the valve o, opening h, and contracted portion Eof the tube B with the contracted ,portion of the body A and itsvalve-seat n, and with the overflow-branch, all substantially as and forthe purpose herein set forth.

In testimony whereof I 1have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES FERGUS. Witnesses:

E. H. ECKFELDT, HARRY SMITH.

